CN103725900A - Method for removing arsenic and sulfur from tin concentrate - Google Patents
Method for removing arsenic and sulfur from tin concentrate Download PDFInfo
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- CN103725900A CN103725900A CN201310739424.5A CN201310739424A CN103725900A CN 103725900 A CN103725900 A CN 103725900A CN 201310739424 A CN201310739424 A CN 201310739424A CN 103725900 A CN103725900 A CN 103725900A
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Abstract
The invention relates to a method for removing arsenic and sulfur from tin concentrate, which comprises the following steps: selecting high-arsenic sulfur tin concentrate, feeding the high-arsenic sulfur tin concentrate into a rotary kiln, and roasting at high temperature to remove arsenic and sulfur to obtain roasted ore; and uniformly mixing the low-arsenic tin-sulfur concentrate, the roasted ore, the reducing agent, the flux and the production intermediate product, smelting in an electric furnace, taking a slag sample for analysis, and discharging slag when the tin content in the slag sample is lower than 5%. The method for removing arsenic and sulfur from tin concentrate is superior to the prior art, and has obvious effects of removing arsenic and sulfur.
Description
Technical field
A kind of method that the present invention relates to tin concentrate dearsenification desulfurization, belongs to metal smelting field.
Background technology
At present, each tin is smelted manufacturer and is all adopted rotary kiln dearsenification desulfurization, high pozzuolite ore deposit is together with the intermediates scoria producing in production process, be mixed even after through rotary kiln high temperature dearsenification sulphur, 850～950 ℃ of maturing temperatures, control kiln tail negative pressure and temperature control technique, in scoria, part tin ferrous metal fusing point is low, material is in kiln internal cause scoria melting conglomeration, after conglomeration, heat does not distribute in time, sulphur is spontaneous combustion at high temperature, temperature is more and more higher, temperature exceedes the fusing point of material, partial material starts to melt, material becomes knot kiln by starting conglomeration, when knot kiln is too thick, the inside part thioneine does not have enough oxygen to participate in reaction, at high temperature, sulphur reacts generation tin sulfide formation gaseous state and takes away with flue gas with tin, when tin sulfide runs into airborne oxygen, reaction generates sulfurous gas and stannic oxide, stannic oxide is collected in bagroom, therefore, the stanniferous height of flue dust, generally can reach 8～12%, sometimes can reach more than 20%, roasted ore arsenic+sulphur≤0.8%.Type of heating adopts bituminous coal direct heating, and oxygen enters kiln body deficiency.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of method of tin concentrate dearsenification desulfurization, and the present invention is better than prior art, desulfurization dearsenification successful.
The technical scheme that the present invention solves the problems of the technologies described above is as follows: a kind of method of tin concentrate dearsenification desulfurization, comprising:
1) get tin concentrate, pick out high pozzuolite tin concentrate and low pozzuolite tin concentrate, low pozzuolite tin concentrate is standby, high pozzuolite tin concentrate is sent in rotary kiln, and high-temperature roasting dearsenification desulfurization, controls tin concentrate and does not lump in rotary kiln during roasting, obtain roasted ore, now, the content of arsenic+sulphur accounts for roasted ore total amount≤0.5%, decreasing ratio >=85% of arsenic+sulphur;
2) get low pozzuolite tin concentrate, roasted ore, reductive agent, flux and production intermediates are mixed evenly, obtain mixtures of materials, first getting 20% mixtures of materials sends in electric furnace and smelts, after 1～3 hour, getting 20% mixtures of materials sends in electric furnace and smelts again, after 1～3 hour, getting for the third time 20% mixtures of materials sends in electric furnace and smelts, after 1～3 hour, getting 20% mixtures of materials for the 4th time sends in electric furnace and smelts, after 1～3 hour, mixtures of materials under the 5th remainder is sent in electric furnace and is smelted, again smelt after 12 hours, put for the first time tin, after mixtures of materials has all melted, put for the second time tin, then carry out slag making, furnace temperature raises, make the tin gangue of all infusibilities be molten state, stannic oxide is fully reduced into metallic tin, make tin separation with slag, get slag sample analysis, when stanniferous amount in slag specimen is lower than 5% time, slagging, from beginning, to the tap to tap time that completes a stove, be controlled in 24 hours, it is stove every day one, .
On the basis of technique scheme, the present invention can also do following improvement.
Further, 1) in, in described high pozzuolite tin concentrate, the content of arsenic and sulphur accounts for high pozzuolite tin concentrate total amount >=3%, and in described low pozzuolite tin concentrate, the content of arsenic and sulphur accounts for low pozzuolite tin concentrate total amount <3%.
Further, 1) in, 800～900 ℃ of described maturing temperatures, roasting time is 1～3h.
The beneficial effect that adopts this step is more than 850 ℃, and sulphur and oxygen reaction generate sulfur dioxide removal, and it is thermopositive reaction that sulphur and oxygen react, and produces a large amount of heat, supplements the required heat of partial roasting; Arsenic is under anoxic, and pentavalent arsenic is reduced into trivalent arsenic, and white arsenic is at high temperature sublimed into gaseous state and removes, and white arsenic is condensed into solid-state at low temperatures, by bagroom, reclaims.
Further, 2) in, described reductive agent is coke or hard coal; Described flux is one or both the mixture in silica, Wingdale; Described production intermediates are one or both the mixture in flue dust, scoria.
Further, 2) in, the ratio of the add-on of described low pozzuolite tin concentrate, roasted ore, reductive agent, flux, production intermediates is 1:(1～3): (0.1～0.3): (0.1～0.3): (1～3).
Further, 2) in, the temperature of described electrosmelting is 1100～1350 ℃.
The beneficial effect that adopts this step is in smelting process, while putting tin, slagging, all some slag and tin mix, in technique, be referred to as second tin, in second tin, have a large amount of metallic tins, simultaneously the fusing point lower (230 ℃ of tin fusing points) of tin, second tin is through heating by electric cooker, metallic tin is separation with slag, and the slag after separation claims scoria, and scoria is mainly stannic oxide, ferric oxide, silicon oxide, calcium oxide, small portion tin ferrous metal and a small amount of pozzuolite composition.
The get away method difference with the prior art of desulfurization of tin concentrate of the present invention:
First, scoria does not add the roasting together of high pozzuolite tin concentrate, and roasted ore, for loose ore deposit, does not allow roasted ore conglomeration;
Secondly, rotary kiln temperature is easy to control, and only otherwise knot kiln, the burning that just can relievedly give gas, has clustering phenomena, minimizing gas-fired, and horse back can solve;
The 3rd, roasted ore arsenic+sulphur≤0.5%, because roasted ore pozzuolite is low, scoria is hardly containing pozzuolite;
The 4th, temperature control, and sulphur spontaneous combustion heat distributes in time, and the reaction of sulphur and tin does not just occur in dearsenification sulphur process, only has the dust of a small amount of stanniferous utmost point level to be pumped in cloth bag chamber, therefore, cloth bag chamber accept containing arsenic powder dirt stanniferous≤5%, economic benefit is high;
The 5th, technology controlling and process is simple and reliable, only needs kiln feelings in routine observation kiln.
Embodiment
Below principle of the present invention and feature are described, example, only for explaining the present invention, is not intended to limit scope of the present invention.
Embodiment 1
1) get tin concentrate, pick out high pozzuolite tin concentrate and low pozzuolite tin concentrate, low pozzuolite tin concentrate is standby, and high pozzuolite tin concentrate is sent in rotary kiln, high-temperature roasting dearsenification desulfurization, 900 ℃ of maturing temperatures, roasting time is 3h, controls tin concentrate and do not lump in rotary kiln during roasting, obtain roasted ore, now, the content of arsenic+sulphur accounts for roasted ore total amount≤0.5%, decreasing ratio >=90% of arsenic+sulphur;
2) get low pozzuolite tin concentrate, roasted ore, reductive agent coke, flux silica and production intermediates flue dust are mixed evenly, the ratio of add-on is 1:3:0.1:0.3:3, obtain mixtures of materials, first getting 20% mixtures of materials sends in electric furnace and smelts, the temperature of smelting is 1300 ℃, after 3 hours, getting 20% mixtures of materials sends in electric furnace and smelts again, after 3 hours, getting for the third time 20% mixtures of materials sends in electric furnace and smelts, after 3 hours, getting 20% mixtures of materials for the 4th time sends in electric furnace and smelts, after 3 hours, mixtures of materials under the 5th remainder is sent in electric furnace and is smelted, again smelt after 12 hours, put for the first time tin, after mixtures of materials has all melted, put for the second time tin, then carry out slag making, furnace temperature raises, make the tin gangue of all infusibilities be molten state, stannic oxide is fully reduced into metallic tin, make tin separation with slag, get slag sample analysis, when stanniferous amount in slag specimen is lower than 5% time, slagging, from beginning, to the tap to tap time that completes a stove, be controlled in 24 hours, it is stove every day one, .
Embodiment 2
1) get tin concentrate, pick out high pozzuolite tin concentrate and low pozzuolite tin concentrate, low pozzuolite tin concentrate is standby, and high pozzuolite tin concentrate is sent in rotary kiln, high-temperature roasting dearsenification desulfurization, 850 ℃ of maturing temperatures, roasting time is 3h, controls tin concentrate and do not lump in rotary kiln during roasting, obtain roasted ore, now, the content of arsenic+sulphur accounts for roasted ore total amount≤0.5%, decreasing ratio >=95% of arsenic+sulphur;
2) get low pozzuolite tin concentrate, roasted ore, reductive agent hard coal, flux Wingdale and production intermediates scoria are mixed evenly, the ratio of add-on is 1:1:0.1:0.1:3, obtain mixtures of materials, first getting 20% mixtures of materials sends in electric furnace and smelts, the temperature of smelting is 1300 ℃, after 1 hour, getting 20% mixtures of materials sends in electric furnace and smelts again, after 1 hour, getting for the third time 20% mixtures of materials sends in electric furnace and smelts, after 1 hour, getting 20% mixtures of materials for the 4th time sends in electric furnace and smelts, after 1 hour, mixtures of materials under the 5th remainder is sent in electric furnace and is smelted, again smelt after 12 hours, put for the first time tin, after mixtures of materials has all melted, put for the second time tin, then carry out slag making, furnace temperature raises, make the tin gangue of all infusibilities be molten state, stannic oxide is fully reduced into metallic tin, make tin separation with slag, get slag sample analysis, when stanniferous amount in slag specimen is lower than 5% time, slagging, from beginning, to the tap to tap time that completes a stove, be controlled in 24 hours, it is stove every day one, .
The foregoing is only preferred embodiment of the present invention, in order to limit the present invention, within the spirit and principles in the present invention not all, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (6)
1. a method for tin concentrate dearsenification desulfurization, is characterized in that, comprising:
1) get tin concentrate, pick out high pozzuolite tin concentrate and low pozzuolite tin concentrate, low pozzuolite tin concentrate is standby, and high pozzuolite tin concentrate is sent in rotary kiln, and high-temperature roasting dearsenification desulfurization, obtains roasted ore;
2) get low pozzuolite tin concentrate, roasted ore, reductive agent, flux and production intermediates are mixed evenly, obtain mixtures of materials, first getting 20% mixtures of materials sends in electric furnace and smelts, after 1～3 hour, getting 20% mixtures of materials sends in electric furnace and smelts again, after 1～3 hour, getting for the third time 20% mixtures of materials sends in electric furnace and smelts, after 1～3 hour, getting 20% mixtures of materials for the 4th time sends in electric furnace and smelts, after 1～3 hour, mixtures of materials under the 5th remainder is sent in electric furnace and is smelted, again smelt after 12 hours, put for the first time tin, after mixtures of materials has all melted, put for the second time tin, then carry out slag making, furnace temperature raises, make the tin gangue of all infusibilities be molten state, stannic oxide is fully reduced into metallic tin, make tin separation with slag, get slag sample analysis, when stanniferous amount in slag specimen is lower than 5% time, slagging, .
2. method according to claim 1, it is characterized in that, 1) in, in described high pozzuolite tin concentrate, the content of arsenic and sulphur accounts for high pozzuolite tin concentrate total amount >=3%, and in described low pozzuolite tin concentrate, the content of arsenic and sulphur accounts for low pozzuolite tin concentrate total amount <3%.
3. method according to claim 1, is characterized in that, 1) in, 800～900 ℃ of described maturing temperatures, roasting time is 1～3h.
4. method according to claim 1, is characterized in that, 2) in, described reductive agent is coke or hard coal; Described flux is one or both the mixture in silica, Wingdale; Described production intermediates are one or both the mixture in flue dust, scoria.
5. method according to claim 1, it is characterized in that, 2) in, the ratio of the add-on of described low pozzuolite tin concentrate, roasted ore, reductive agent, flux, production intermediates is 1:(1～3): (0.1～0.3): (0.1～0.3): (1～3).
6. method according to claim 1, is characterized in that, 2) in, the temperature of described electrosmelting is 1100～1350 ℃.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106801141A (en) * | 2017-03-24 | 2017-06-06 | 南昌专腾科技有限公司 | A kind of Tin concentrate ore-sorting system and technique for removing arsenic removal and sulphur |
| CN106811593A (en) * | 2017-03-24 | 2017-06-09 | 南昌专腾科技有限公司 | A kind of Tin concentrate ore-sorting system and technique |
| CN106929692A (en) * | 2016-12-14 | 2017-07-07 | 衡阳旺发锡业有限公司 | The energy-efficient tin metallurgy equipment and its application process on a kind of double molten tin inclined-planes of band |
| CN108611492A (en) * | 2018-04-17 | 2018-10-02 | 安徽华铂再生资源科技有限公司 | A kind of technique that thick tin is smelted in the press filtration solids from sodium stannate solution |
| CN111961840A (en) * | 2020-09-01 | 2020-11-20 | 云南锡业股份有限公司锡业分公司 | Roasting treatment process of high-As high-S tin concentrate in fluidized bed roaster |
| CN114836617A (en) * | 2022-04-20 | 2022-08-02 | 柳州华锡有色设计研究院有限责任公司 | Method for efficiently smelting high-sulfur high-arsenic tin concentrate |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106929692A (en) * | 2016-12-14 | 2017-07-07 | 衡阳旺发锡业有限公司 | The energy-efficient tin metallurgy equipment and its application process on a kind of double molten tin inclined-planes of band |
| CN106801141A (en) * | 2017-03-24 | 2017-06-06 | 南昌专腾科技有限公司 | A kind of Tin concentrate ore-sorting system and technique for removing arsenic removal and sulphur |
| CN106811593A (en) * | 2017-03-24 | 2017-06-09 | 南昌专腾科技有限公司 | A kind of Tin concentrate ore-sorting system and technique |
| CN108611492A (en) * | 2018-04-17 | 2018-10-02 | 安徽华铂再生资源科技有限公司 | A kind of technique that thick tin is smelted in the press filtration solids from sodium stannate solution |
| CN111961840A (en) * | 2020-09-01 | 2020-11-20 | 云南锡业股份有限公司锡业分公司 | Roasting treatment process of high-As high-S tin concentrate in fluidized bed roaster |
| CN111961840B (en) * | 2020-09-01 | 2021-11-23 | 云南锡业股份有限公司锡业分公司 | Roasting treatment process of high-As high-S tin concentrate in fluidized bed roaster |
| CN114836617A (en) * | 2022-04-20 | 2022-08-02 | 柳州华锡有色设计研究院有限责任公司 | Method for efficiently smelting high-sulfur high-arsenic tin concentrate |
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Effective date of registration: 20220525 Address after: 541600 Wenshi Town Industrial Park, Guanyang County, Guilin City, Guangxi Zhuang Autonomous Region Patentee after: Guilin Guanyang Hengfeng Metal Technology Co.,Ltd. Address before: 541600 XISHANPING Industrial Zone, Guanyang County, Guilin City, Guangxi Zhuang Autonomous Region Patentee before: GUANYANG COUNTY GUIDA NON-FERROUS METALS CO.,LTD. |